Datasheet
REFx
sensor
28
'$7$[ ¦
¦
2
Active Channel
Sensor Signal
Sensor
Activation
Conversion
Amplitude
Correction
Conversion
Amplitude
Correction
Conversion
Amplitude
Correction
38
LDC1612
,
LDC1614
SNOSCY9A –DECEMBER 2014–REVISED MARCH 2018
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Application Information (continued)
(1) Channels 2 and 3 are only available for LDC1614
Figure 54. Single-Channel Mode Sequencing
Table 36. Single and Multi-Channel Configuration Registers
MODE REGISTER FIELD VALUE
(1)
Single channel
CONFIG, addr 0x1A ACTIVE_CHAN [15:14]
00 = chan 0
01 = chan 1
10 = chan 2
11 = chan 3
MUX_CONFIG addr 0x1B AUTOSCAN_EN [15]
0 = continuous conversion on a
single channel (default)
Multi-channel
MUX_CONFIG addr 0x1B AUTOSCAN_EN [15]
1 = continuous conversion on
multiple channels
MUX_CONFIG addr 0x1B RR_SEQUENCE [14:13]
00 = Ch0, Ch 1
01 = Ch0, Ch 1, Ch 2
10 = Ch0, CH1, Ch2, Ch3
(1) Channels 2 and 3 available only in LDC1614.
(2) The DATAx_MSB register must always be read prior to the DATAx_LSB register of the same channel to ensure data coherency.
(3) A DATAx value of 0x000'0000 indicates an under-range condition for LDC1612/LDC1614 corresponding channel
(4) A DATAx value of 0xFFF'FFFF indicates an over-range condition for LDC1612/LDC1614 corresponding channel
The digitized sensor measurement for each channel (DATAx) represents the ratio of the sensor frequency to the
reference frequency.
With FREF_DIVIDERx and FIN_DIVIDERx set to 1, the sensor frequency can be calculated from:
(4)
The following table illustrates the registers that contain the fixed point sample values for each channel. The
conversion result for each channel, DATAx, can be calculated with:
DATAx = DATAx_MSB×65536 + DATAx_LSB (5)
Table 37. LDC1612/1614 Sample Data Registers
CHANNEL
(1)
REGISTER
(2)
FIELD NAME [ BITS(S) ] VALUE
(3)(4)
0 DATA0_MSB, addr 0x00 DATA0 [27:16] 12 MSBs of the 28 bit conversion for Channel 0
DATA0_LSB addr 0x01 DATA0 [15:0] 16 LSBs of the 28 bit conversion for Channel 0
1 DATA1_MSB, addr 0x02 DATA1 [27:16] 12 MSBs of the 28 bit conversion for Channel 1
DATA1_LSB, addr 0x03 DATA1 [15:0] 16 LSBs of the 28 bit conversion for Channel 1
2 DATA1_MSB, addr 0x04 DATA2 [27:16] 12 MSBs of the 28 bit conversion for Channel 2
DATA1_LSB, addr 0x05 DATA2 [15:0] 16 LSBs of the 28 bit conversion for Channel 2
3 DATA1_MSB, addr 0x06 DATA3 [27:16] 12 MSBs of the 28 bit conversion for Channel 3
DATA1_LSB, addr 0x07 DATA3 [15:0] 16 LSBs of the 28 bit conversion for Channel 0